<template>
  <div class="category">
    <h1>当前求和为：{{ sum }}</h1>
    <h1>当前求和*10为：{{ bigSum}}</h1>
    <h3>我在{{ school }}学习{{subject}}</h3>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等一等再见</button>
  </div>
</template>

<script>
import {mapState,mapGetters} from "vuex";

export default {
  name: "Count",
  data() {
    return {
      n: 1 //用户选择的数字
    }
  },
  methods: {
    increment() {
      //this.$store.commit("JIA",this.n)
      this.$store.state.sum += this.n //vue开发者工具检测不到
    },
    decrement() {
      this.$store.commit("JIAN", this.n)
    },
    incrementOdd() {
      this.$store.dispatch("jiaOdd", this.n)
    },
    incrementWait() {
      this.$store.dispatch("jiaWait", this.n)
    }
  },
  mounted() {
    const x = mapState({he: 'sum', xx: "school", dz: 'subject'})
    console.log(this)
  },
  computed: {
    //借助mapState生成计算属性,从state中读取数据(对象写法)
    // ...mapState({he: 'sum', xx: "school", dz: 'subject'}),

    //借助mapState生成计算属性，从state中读取数据。（数组写法)
    ...mapState(['sum','school','subject']),
    ...mapGetters(['bigSum'])
  }
}
</script>

<style scoped>
button {
  margin-left: 5px;
}
</style>